Jsoncpp Article 2-API

For more api reference, see jsoncpp header file

1. A brief description of jsoncpp APIs

1. parse (convert JSON string to object)

STD: String strdatajson;

JSON: reader jreader;

JSON: Value jobject;

If (! Jreader. parse (strdatajson, jobject ))

{

Cerr <"parse JSON error." <Endl;

Return bsuccess;

}

2. Read

STD: String strmsg = JREC ["MSG"]. asstring ();

Int nretcode = JREC ["RET"] .. asint ();

JSON: Value jlist = JREC ["data"] ["list"];

Int nsize = jlist. Size ();

Get error message: jreader. getformatederrormessages ()

3. Add or modify

Jroot ["stringdata"] = JSON: Value ("MSG ");

Jroot ["intdata"] = JSON: Value (10 );

4. Delete

Jvalue. removemember ("toberemove ");

5. Convert the object into a string

JSON: fastwriter fast_writer;

Strjreclist = fast_writer.write (jroot );

// Formatted JSON with a carriage return line break

STD: String Strout = jroot. tostyledstring ();

Conversion from http://my.oschina.net/chenleijava/blog/144312

2. Detailed API

class JSONAPI_API JsonValue{typedef std::map<std::string, JsonValue*>InnerMap;typedef std::vector<JsonValue*>InnerVector;public:JsonValue();virtual ~JsonValue();public:void clear();//import/exportvoid parse(const char* jsonString);JsonString toString();JsonString toString_styled();void toFile(const char* filename);void toFile_styled(const char* filename);//setvoid operator=(JsonValue& jval);void operator=(char vInteger);void operator=(unsigned char vInteger);void operator=(short vInteger);void operator=(unsigned short vInteger);void operator=(long vInteger);void operator=(unsigned long vInteger);void operator=(int vInteger);void operator=(unsigned int vInteger);void operator=(__int64 vInteger);void operator=(unsigned __int64 vInteger);void operator=(float vReal);void operator=(double vReal);void operator=(bool vBoolean);void operator=(const char* vString);int append(JsonValue& jval);int append(char vInteger);int append(unsigned char vInteger);int append(short vInteger);int append(unsigned short vInteger);int append(long vInteger);int append(unsigned long vInteger);int append(int vInteger);int append(unsigned int vInteger);int append(__int64 vInteger);int append(unsigned __int64 vInteger);int append(float vReal);int append(double vReal);int append(bool vBoolean);int append(const char* vString);//getJsonValue& operator [](const char* name);JsonValue& operator [](unsigned int arrIdx0);//get final valuechargetChar();unsigned chargetUChar();shortgetShort();unsigned shortgetUShort();longgetLong();unsigned longgetULong();intgetInt();unsigned intgetUInt();__int64getInt64();unsigned __int64 getUInt64();boolgetBoolean();floatgetFloat();doublegetDouble();const char*getString();//checkbool isNull();bool isChar();bool isUChar();bool isShort();bool isUShort();bool isLong();bool isULong();bool isInt();bool isUInt();bool isInt64();bool isUInt64();bool isBoolean();bool isFloat();bool isDouble();bool isString();bool isObject();bool isArray();protected:ValueType m_valueType;union{__int64 m_integer;double m_real;bool m_boolean;char* m_string;InnerMap* m_kv;InnerVector* m_array;}m_v;protected:void setAsObject();void setAsArray();friend JValHelper;};